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Noob question about PiHole
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this post was submitted on 17 Jan 2024
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When it comes to a “secondary”DNS... there is nothing like a primary and secondary DNS server. These indications are quite misleading but many systems adopted it this way. Pihole only list the DNS servers as primary and secondary, because this is what the providers write on their pages. The bad phrasing is supported especially by how Windows handles it.
Most operating systems implement DNS servers as alternatives, not as fallbacks, i.e. they will query any of both servers from time to time, so it is quite likely that you will loose your Pi-hole filtering capabilities (at least partially) [if you specify a secondary DNS server on your network].
The ONLY DNS server you should have set on your network is a/the PiHole(s).
I'm not sure if this is a response to my comment but the article I linked isn't about setting a secondary dns, the fritz!box has a function that allows it to temporarily change the dns (usually to 8.8.8.8) if the specified dns isn't working. It is separate from the "normal" dns settings.
Not sure about that as I never used/seen a Fritzbox, but I stand by “ The ONLY DNS server you should have set on your network is a/the PiHole(s).”